Process for the manufacture of boots and shoes



c. BEHRENS 1,996,270

PROCESS FOR THE MANUFACTURE OF BOOTS AND SHOES April 2, 1935.

Filed May 21, 1932 Patented Apr. 2, 1935 1 v UNITED STATES PATENT OFFICE PROCESS FOR THE MANUFACTURE or 1 noo'rs AND SHOES Carl Behrens, Alfeld-onthe-Leine, Germany Application May 21, 1932, Serial No. 612,697 In Great Britain May 21, 1931 1 Claim.. (01. 12-145) Heretofore, in the manufacture of bootsand rection. Since leather is a material which, when shoes, after fixing the insole to the bottom of it is elongated in one direction, becomes shorter the tac t, the uppe h b pulled Over in the transverse direction, this longitudinal elona d ts edges ve be e f 1a$ted round gation causes the upper to be pressed in all places 5 the edge of the insole. This lasting stretches against the last Said upper being thereby 5 the leather transversely acrs$ the1astgiven the correct shape. In this position, the

In the new process, stretching of the upper is effected by adjustin the len th of the last upper fixed to the msde' g g It is clear that a very definite degree of stretchthat 1s to say by stretching the leather in the mg corresponds to a definite magnitude of the lon itudin 1 Y V 10 g dlrectmn of the last The lastmg extension of the last for stretching, and that it 10 process employed heretofore is thereby eliminated and stretching no longer depends upon 15 thus posslble at any tune to lmpa'rt r the feel of the workman but upon the magnitude stretch to the leatherof the elongation of thelast during lasting and I clwmr- V 15 can therefore be proportioned most exactly. A D manufacturing footwear Whleh A last to be employed for example in the ne consists in fastening an insole and a vamp at I process is shown in the accompanying drawing, the front and at the heel portion to a shoe-last According to the new process, th 1a ti h tadjustable in a longitudinal direction, after the ened what, for example as shown, that is last has been shortened, whereupon the leather,

20 to say, the heel part is lifted by means of the fastened on the last, is stretched with equal ten- 20 screw-threaded spindle, the entire length of the sion in all cross-sectional parts by a mutual slidlast being thereby reduced. In this condition, ing motion of the components of the last relative the insole is first fixed in known manner on the to each other and in a direction oblique to the sole of the last and the upper is likewise pulled longitudinal axis of the shoe-last, while at the V 5 over. Thereupon, the last is brought to the norsame time the direction of the stress during the mal length by means of the screw-threaded spinstretching is permanently changed, and uniting die, that is to say, the heel portion is brought the insole with the vamp in this position throughinto the dotted line position whereby the leather out their whole length. is stretched on the last in the longitudinal di- CARL BEHRENS. 

